Database Fundamentals for CompTIA Tech+ (FC0-U71): Primary Keys, Foreign Keys, and SQL Basics
Every certification path CompTIA offers eventually runs into the same wall: data has to live somewhere, and something has to organize it. For the CompTIA Tech+ (FC0-U71) exam — the entry-level cert formerly known as ITF+ — that "somewhere" is covered under Domain 5.0, Database Fundamentals, worth roughly 9% of the exam. It is a small slice of the blueprint, but it is also one of the few domains where a handful of clean definitions can lock in several guaranteed questions. This article walks through what a database actually is, how relational databases organize information with primary and foreign keys, the handful of SQL commands Tech+ expects you to recognize, and how relational databases differ from their NoSQL cousins. What a Database Actually Is A database is an organized collection of data that a database management system (DBMS) — software like MySQL, PostgreSQL, Microsoft SQL Server, or MongoDB — controls, stores, and retrieves on request. The word "organized...